Franklin Ace 1000 Technical Reference Manual

Frank!

Computer

2128 ROUTE 38
CHERRY HILL, NEW JERSEY 08002
609 482-5900 • TELEX 837-385

DATE:

TO :

FROM:
SUBJECT :

March 22, 1984

Authorized Service Centers

P. F. Sant o re

Manager, Technical Services
Technical Reference Manual Update

Enclosed are new additions for your Technical Reference Manual
and a special parts offer for the new MPI Drive and Rev. A
Motherboard (P/N 1100019-01). Also included is a new Table of
Contents which includes the new additions.

The new additions cover the Rev. A Motherboard, which was
introduced in the Family Pack, the MPI Disk Drive, the Franklin
Video Monitor, and a Troubleshooting Guide.

The documents on the Rev. A Motherboard, Disk Drive and Monitor
have been developed using a new format for the Technical
Reference Manual. Each new section has been written as a stand
alone booklet using a standard format to aid in locating
information quickly and easily.

CHANGE LOCATION

1 .

TABLE OF CONTENTS

TABLE OF

CONTENTS

ADDITIONS

LOCATION

2.

MOTHERBOARD REV. A

SECTION

13

3.

DISK DRIVE - MPI

SECTION

14

4.

FRANKLIN MONITOR

SECTION

15

5.

TROUBLESHOOTING GUIDE

SECTION

19

FRANKLIN COMPUTER CORPORATION
1070 BUSCH MEMORIAL HIGHWAY
PENNSUAKEN, N. J. 08110

(609) 488-0600

DEALER SERVICE MANUAL

1

TABLE OF CONTENTS

SECTION 1 - GENERAL INFORMATION

GEN-001 . 1

FCC Service Center

SECTION 2 - PROCEDURES

PRO-OOl . 1
PRO-002. 1
PRO-003 . 1
PRO-004 . 1

Warranty Service Report
Parts Order Procedure
Defective Material Tag
Parts Return Procedure

SECTION 3 - WARRANTY REPAIR

WAR-001 . 1

Warranty Policies and Procedures

SECTION 4 - NON WARRANTY REPAIR

NWA-001 . 1

Non-Warranty Policies and Procedures

SECTION 5 - SERVICE CENTER INVENTORY

INV-001
INV-002. 1
INV-003. 1
INV-004

Service Center Inventory Requirement
ACE Computer Parts Kit
Floppy Disk Subsystem Parts Kit
Franklin Peripheral Cards

SECTION 6 - DEALER PARTS LIST

DPA-001 . 1

ACE Computer Dealer Parts List

SECTION 7 - RETAIL PARTS LIST

RPA-001 . 1

ACE Computer Retail Parts List

SECTION 8 - ACE 100/1000/1200 TECHNICAL INFORMATION BULLETINS

AC 1-001
AC 1-00 2
AC 1-003
AC 1 -00 4
AC1-005
AC1-006
ACI-007

EPROM Revision Levels

FRANKLIN/ APPLE Keyboard Differences

I.C. Specification for Motherboard

230V, 50HZ Conversion

I.C. Specification for Colorboard

Dual I/O Interfacing

Keyboard

SECTION 9 - ACE COMPUTER DIAGNOSTICS

SECTION 10 - DISK SUBSYSTEM THEORY OF OPERATION

2

SECTION 11

DISK SUBSYSTEM TECHNICAL INFORMATION BULLETINS

DSK-001 Floppy Disk Analog Modification

DSK-002.I ACE 10 Subsystem Alignment Procedures

SECTION 12 - SOFTWARE TECHNICAL INFORMATION BULLETINS

SOF

SOF

-001

-002

SECTION

13 -

SECTION

14 -

SECTION

15 -

SECTION

16 -

SECTION

17 -

SECTION

18 -

SECTION

19 -

TBS

-001

AppleWriter Modification
MUSE Supertext Modification

REV. A MOTHERBOARD P/N 1100019-01

DISK DRIVE - MPI

FRANKLIN MONITOR

TROUBLESHOOTING INFORMATION

TROUBLESHOOTING GUIDE - QUICK REFERENCE

3

MOTHERBOARD REV A
P/N 1100019—01

TABLE OF CONTENTS

GENERAL INFORMATION 1-1

SPECIFICATIONS 2-1

INSTALLATIONS 3-1

THEORY OF OPERATIONS 4-1

MAINTENANCE 6-1

PARTS LIST 7-1

1

Franklin Technical Manual ACE 1000/1200 Motherboard Rev A P/N 1100019-01

GENERAL INFORMATION

The Franklin motherboard, P/N 1100019-01, REV A, contains all of the basic
circuitry to provide the user with both a black and white and full color
system with 64K of memory, an auto start basic interpreter and a two drive
disk controller. When placed into an ACE 1000, 1100 or 1200 with the

standard 72-key keyboard, 50 watt power supply and monitor a very powerful
and versatile system exists.

Options from Franklin and/or a variety of O.E.M. companies allow you to
expand the system to include combinations of equipment up to a total of six
floppy disk drives, a hard disk, 80-column capability, a Z80 micro processor
for CP/M compatibility, serial or parallel printers, expanded memory and
joysticks for games.

Most of these options require only an additional circuit board that is plugged
into one of the available I/O slots located on the rear of the board, marked
JO through J7. Not all of the equipment mentioned above can be installed at
the same time due to system configuration limitations.

NOTE: In the board's present arrangement slot J6 is not available for

external circuit cards.

Figure 1-1 shows a basic configuration of the expansion boards available to an
ACE system.

1-1

Motherboard Rev A P/N 1100019-01 ACE 1000/1200 Franklin Technical Manual

DUAL I/O INTERFACE FOR A
SERIAL OR A PARALLEL PRINTER

SERIAL I/O INTERFACE (NOT
AVAILABLE IF DUAL I/O IS IN
SLOT J1)

ACE DISPLAY CARD

RAM EXPANSION CARD

ACE 80 CPU CARD -OR
DISK CONTROLLER CARD FOR
DRIVES 5 AND 6

FLOPPY DISK DRIVE
CONTROLLER FOR DRIVES
3 AND 4

DO NOT USE

HARD DISKSYSTEMCONTROLLER

Figure 1-1, Suggested Placement of OEM Peripheral Cards.

Franklin Technical Manual ACE 1000/1200 Motherboard Rev A P/N 1100019-01

SPECIFICATIONS

Microprocessor

6502 operating at 1.02 Mhz

Text

40 characters per line by 24 lines

5X7 dot uppercase characters

5X7 dot lowercase characters

Normal, inverse and flashing characters

Full cursor controlled-protected screen feature

High Resolution
Graphics

280 Horz X 192 Vert pixels

280 Horz X 160 Vert with 4 lines of text

Memory

64K RAM

250 NSEC Access time
3 sockets for eproms

Physical

17 3/8" deep X 11 1/2" wide

Power Required

115 Vac, 60 Hz, 50 watts

Master Clock

14.31818 Mhz.

Color Resolution

16 colors Lo Res
6 colors Hi Res

2-1

Franklin Technical Manual ACE 1000/1200 Motherboard Rev A P/N 1100019-01

INSTALLATION

STEP 1

STEP 2

STEP 3

• Remove power cable.

• Place thumbs in slots, apply-
ing slight outward pressure
while lifting cover with
fingers.

• Raise cover by pulling it
forward.

• Check for and remove all
peripheral circuit cards in
slots JO through J7.

• Remove monitor cable.

• Remove floppy disk drive
cables.

• Remove game I/O cables if
necessary.

• Turn unit upside down being
careful not to damage key-
board.

• Remove the 11 screws (shown
in circles) from base plate.

3-1

Motherboard Rev A P/N 1100019-01 ACE 1000/1200 Franklin Technical Manual

STEP 4

STEP 5

• Turn unit right side up for-
ward to reveal the keyboard
connection.

• Lift case by tilting it
forward to reveal the key-
board connection.

• Remove ribbon connector from
Jack D3.

• Using a phillips head screw-
driver, remove the 10 screws
that hold the motherboard to
the base plate.

• Remove the power supply,
speaker and reset switch
cables .

• Carefully lift the old mother-
board to prevent damage to
components.

• To install new motherboard
reverse steps 1-6.

STEP 6

3-2

Franklin Technical Manual ACE 1000/1200 Motherboard Rev A P/N 1100019-01

THEORY OF OPERATION

When power is applied to an ACE 1000 series unit the following sequence of
events will take place. These events will happen in a span of time less than
one second. After you have seen these events happen correctly a few times,
you will be able to "sense" when the machine has a malfunction.

To begin, you should have your monitor connected and powered on for a few
seconds before you turn on the power supply switch. The first thing that
you should see is a full screen of characters. This page of characters will
often differ between units. However, the characters will most often be a full
page of inverse "AT" signs (@) because they have a HEX code of "00." The
screen pattern is a result of the RAM being cleared out to make room for the
system's resident routines to initialize.

Next, the speaker will emit a single "beep" as location $C030 is cleared. This
beep will be followed immediately by the screen being cleared. This step
ends the housekeeping phase. The next phase is the auto boot ROM (H2)
bringing the unit into its normal operation. The first visible step will be the
writing on the screen of

ACE 1000 v2 . 2
or

ACE 1200 v2 . 3

depending on which unit you are testing. The system will then search
through each I/O slot for a disk controller card starting at J7 and going to
JO.

— If a disk controller card is found the system will initiate a "read"
operation until a disk is located or the operator pushes the RESET switch
under the keyboard. RESET will bring up FPBASIC with the prompt (]) on
the lower left of the screen.

— If no disk controller is found the unit goes directly to FPBASIC as noted
above .

If all of the above events happen to your unit, then your machine is probably
operating normally unless you already know otherwise.

The following is a brief description of how each major circuit functions. In
the event your unit does not work and you suspect that the motherboard is
at fault, you can use the information below in guiding you to troubleshoot the
board. Whenever possible, the IC "chips" are given names based on their
functions in the circuit. Reference will be made to the location of the IC by
the letter/number matrix designation (e.g. Floppy disk controller [ H10 ] ;
column H, row 10). A few "chips" made up of OR gates or AND gates may
be used by several circuits making it difficult to designate. However, once
you isolate the problem to a specific area, finding the right component

4-1

Motherboard Rev A P/N 1100019-01 ACE 1000/1200 Franklin Technical Manual

becomes easier. When you read each circuit description, you should follow
along with your BLOCK DIAGRAM at the end of this section. This will
increase your understanding of the circuit relationships.

POWER ON RESET

V/ hen the switch at the rear of the power supply is turned to the ON position
voltages of +5, -5, +12, and -12 VDC are generated and fed to the mother-
board through the 6 PIN connector near the coordinate L-l. A single trigger
is generated by "chip" Cl-B that is sent to the keyboard connector (D3),
disk motor controller (H14), 6502 CPU (J8) and the I/O connectors JO

through J7. The 75 MSEC trigger out of H14 is not used since it occurs
while the line is already pulled low.

TIMING AND CONTROL

The timing and control circuit goes active as soon as power is applied to the
motherboard and remains active until power is removed. All timing signals
originate with the 14.31818 Mhz crystal (E6) and the two transistors QE1 and
QE2. Through E5 , PIN 8, the signal MCLK, for master clock, is generated.
This is the base for all other signals shown in TABLE 4-1. Circuit compon-
ents E2, E3, and E4 act as step down counters that produce signals used by
almost every IC on the board and are accessible by JO through J7 to any
peripheral card connected.

TABLE 4-1

FREQUENCY

DESIGNATION

CIRCUIT USE

14.31818 Mhz

MCKL

VIDEO OUTPUT

7.159

Mhz

COB1 , COB1 (L)

CHARACTER

GENERATOR

3.58

Mhz

COB2 , COB2 , (L)

COLOR BURST
SIGNAL

2.0

Mhz

2Mhz, 2Mhz (L),
CAS (L), R/CAS,
RAS (L)

USED THROUGH-
OUT SYSTEM

1.0

Mhz

IMhz , IMhz (L),
2KC0 , 2KC8

USED THROUGH-
OUT SYSTEM

DATA BUS

The Data Bus is eight lines used to parallel transfer a single byte of
information throughout the system. Since the Bus is shared by memory, the
CPU and all I/O device timing is critical. (Data is input to the Bus from
these areas through various gate circuits . ) The list below identifies those
IC's by location.

Franklin Technical Manual ACE 1000/1200 Motherboard Rev A P/N 1100019-01

FROM

VIA

KEYBOARD

FLOPPY DISK CONTROLLER CARD

6502 CPU

EPROMS

I/O CONNECTORS
RAM MEMORY

D4, D7
H7, H10
J10, Jll

DIRECTLY FROM H2, H4, H5
DIRECTLY FROM PINS
42 THROUGH 49
D4, D5 , D6 , D7

Data on the Bus is available to all circuits that have output capability. The
CPU and the timing network activate whatever circuit requested the data.
The following list shows the path the information will follow after leaving the
BUS.

TO

I/O CONNECTORS
6502 CPU

FLOPPY DISK CONTROLLER
VIDEO MONITOR

VIA

DIRECTLY ON PINS 42 THRU 49
J10, Jll TRANSCEIVERS
H10 GATE ARRAY
RAM MEMORY

VIDEO DISPLAY

Information for display as text or graphics in monochrome or color will follow
basically the same path. The data originates in RAM where specific locations
have been reserved for two pages of 960 character positions (40 char X 24
lines). Information is gated out of RAM (F3 through F10) to the latches (D5,
D6) to the color/text dot generator (C5). Here the Hex coded byte is
converted into a bit stream that will eventually be "painted" on the CRT by
the scan lines.

Outputs from C5, along with the inverse signal from Bll, are gated (C6, C7)
into a storage register (C8, C9). The next LDTG timing pulse transfers the
data to two multiplexers (CIO, D8) whose output is stored briefly at C4 to
await transfer to video phase modular prom (D14) and a storage register
(E13). The combined outputs of D14 and E13 are fed to the RGB interface
connector space (JE2) and to the multiplexer (E14). Output from E14 goes
through QF1 to the Aux Video and video output jacks.

Flashing characters are created by a trigger from Cl- A through an AND gate
(G5, PIN 11) and an OR gate (B4, PIN 4) fed into the inverse circuit (C4).

Sync circuits, timing signals and control signals are numerous within the
video section. The list below gives you the IC locations for most of these
AND gates, OR gates and Flip /Flops.

4-3

Motherboard Rev A P/N 1100019-01

ACE 1000/1200 Franklin Technical Manual

COLUMN

ROW

B

4, 11, 12

C

2, 7, 13

D

2

F

11, 12, 13

G

5, 7, 10,

ADDRESS BUS

The address bus, listed as MAR for Memory Address Register, is a network
of 16 lines that is similar to the Data Bus in that it is throughout the
motherboard and accessible from a variety of circuits. One significant

difference is that all addresses, or all information on the MAR, originates at
the 6502 CPU and is put on the Bus by the address transmitters (J3, J4,
J5). The circuits that can input addresses from the MAR are listed below
with IC coordinates of the circuits through which the information travels.

TO VIA

FLOPPY DISK CONTROLLER DIRECTLY TO H10, H7

EPROM SELECT HI, H8

EPROMS DIRECTLY TO H2, H4, H5

KEYBOARD & SPEAKER H9

I/O CONNECTORS JO THROUGH J7 DIRECTLY TO PINS 2-17

I/O SELECT J12

DEVICE SELECT J2

GAME I/O J14

TEXT & GRAPHICS SELECT G14

RAM E9 , 10, 11, 12, F2

Not all the circuits noted in the list above use all 16 bits of the MAR. Often
only a portion of the address is relevant. In those cases only the 2 or 3 bits
needed will be inputted (e.g. the device enable circuit (J2) only uses MAR
4/5/G/7).

FLOPPY DISK CONTROLLER

This circuit consists of the "ACE FDC" or "Gate- Array" , at H10; stepper
motor speed controller, drive enable, select and read/ write controller, at H12;
the eprom, at H7; and the AND gate, at H13. Data is read from and written
to the data bus directly by the gate array and transmitted in several fashions
to and from the drives via JH3 and JJ1. Address information on where the
data is located on the disk is decoded by H12. This then turns on the
selected drive and activates the drive motor and read /write head assembly.
The eprom of H7 contains a 250 byte data code that controls the gate array.
If a disk controller card is used in slot 6, this circuit must be disabled.

4-4

>

I

CJ1

ACE 1000/1200 Motherboard P/N 1100019-01 Rev A

Franklin Technical Manual ACE 1000/1200 Motherboard Rev A P/N 1100019-01

Franklin Technical Manual ACE 1000/1200 Motherboard Rev A P/N 1100019-01

MAINTENANCE

IC IDENTIFICATION CHART

CONNECTOR AND CONFIGURATION OPTIONS

LOGIC DIAGRAMS — 4 PAGES

6-1

LS74 LS51 LS138 LS08 LS368

Motherboard Rev A P/N 1100019-01 ACE 1000/1200 Franklin Technical Manual

6-2

ACE 1000/1200 Motherboard P/N 1100019-01 REV A IC Identification Chart

6-3

LOCATION OF CONNECTORS AND
CONFIGURATION OPTIONS ON
THE ACE MOTHERBOARD

JB1 : RESET SWITCH INPUT

JC1: SPEAKER OUTPUT

D3: KEYBOARD CONNECTOR

JE 1 : AUXILIARY TIMING OUTPUT

JE2: RGB INTERFACE

G2: WG1 - WG8; MEMORY

CONFIGURATION JUMPERS

JH1: 13 & 16 SECTOR JUMPER

X3,XY3,Y3: MOVE JUMPER FROM X3, XY3

TO XY3, Y3 TO DISABLE ON
BOARD RAM > BFFF

DRV 1 : FLOPPY DISK CONNECTOR

FOR DRIVE #1

DRV2: FLOPPY DISK CONNECTOR

FOR DRIVE #2

JL1, JL2, JL4: AUXILIARY VIDEO OUTPUTS

JL3: VIDEO OUTPUT

RL2: VIDEO OUTPUT SIGNAL (JL3)

TRIMMER POT

ACE 1000/1200 Connector and Configuration Options

Franklin Technical Manual ACE 1000/1200 Motherboard Rev A P/N 1100019-01

DB0 -7 ( DATA BUS 0 THROUGH 7)

Franklin Technical Manual ACE 1000/1200 Motherboard Rev A P/N 1100019-01

CM

v 2 J IC

r~

||0

27

i — j

v ZJlg
^ I

28

CM

1 6
1 6

29

Cb^

^ZJI 1

^ I

r

Jl3_

30

CM

k, ZJI0

t

3 1

tC

r

\ZJIG>

u

32

M 1

1l5_,

Ml

tr

33

M

37

ZBI 1

JlS 0§)^

40

4

6 c

-

RESET(L) I

zu [

— —
LS368

D7

V CC
A 0

9

12 r

V 1

A 1

ZJ5 L'

4

A2

1 i

6 p-

X 7

2 J4

D6

A3

12

ZJ5 U

/

10

13

6 r

v?

Z J 5

A 5

14

ZJ4 U

/

10

D5

A 6

15

12 k

s"

Z J 3

A 7

16

ZJ3 U

6

D4

A8

17

fLT

>5

ZJ3

A Q

18

ZJ3 L-

L |,|5

2

CVJ AI0

19

^ r-

O'

ZJ3

D3

O Al |

20

ZJ4 U

10

in

, _ Al?

22

LT

>3

Z J 4

<D

AI3

23

ZJ4 U

J I,|5

2

D2

— ) AI4

24

14 N

L

ZJ5

AI5

25

ZJ5 U

14

D 1

O Alb
R /W

34

4 I s

>5

2 J 4

RDY

2

2 J5

fl,l5

35

NC

8 T9 7

D0

36

NC

IRQ ($1 -
NMI V SS'
V SS S.O.
21 I 38|

C7XX PM 7 (L)
C6XX PM6 (L)
C5XX PM5 (L)
C4XX PM4 (L)
C3XX PM3 (L)
C2XX PM2 (L)
CIXX PM I (L)

4 ►(4A8)

►(2A7)

C08X PS0 (L)
CQ9X PS I (L)
COAX PS 2 (L)
COBX PS3 (L)
COCX PS4 c L)
CODX PS5 (L)
CQEX PS6 ( L )
COFX PS7 (L) I F

PART OF
J0 thru J7

6 7 5 3 2 8

MAR 0 1
MAR I I
MAR 2 .
MAR 3 1
MAR 4 1
MAR 5 |

MAR 6 |
MAR 7
MAR 8 *
MAR 9 *
MAR IQ |
MAR I I |
MAR I 2
MAR 1 3
MAR 14 T
MAR I 5 |

R/W |
2KC8(L).

RDY 1
DMA (LI 1

NMI (L) ■
IRQ CL) |
RESETCUl

INH(L) I

USER(L)
C0B I I
2MHZ (L) 1
I MHZ (L) j
I MHZ .

USER ( L)^
INH( L)^

f DB6 1

<42

2 DB5 |

4 DB4

4 DB3 1

4 DB2

4 DB! 1

14 DB0 1

2 A t—

<50

MCLK P /° j 7

P/O |-

J 6 (

PM7 (L)
~wl 2

PM I (L) r

; r

DMA OUT I

1 DMA IN
I NT OUT 1

PM2 (L) f

T I

DMA OUT.

DMA IN 1
I NT OUT I

PM3 ( L ) r

r r

DMA OUT I

DMA IN
INT OUT'

"I PM5 (L ) r ,

3C5)^.S/I^ 0 *M>

i SYNC (L) RLI 2000

INT OUT ^
DMA OUT/.

DMA OUT| . 4 j DM A0 U T | < 24 1 D MA OUT) ZJ

P MA IN | <27, L_ QMA IN <27|

INT OUT I INT OUT 1 „

I r— \ 2 3 — f ? 3 >

DMA IN
INT OUtI

COB2 (L)
PS7 (L)

ST*

60 HZ 60 HZ 50 HZ

•"--So HZ .

hardboot softboot hardboot

SOTTBQOT ZQ6£

WB 1

x

X SA3

WCI

x x p

3D8

WEI

X

X 'SBs

W6I

X . . X

2A7

W62

X

X ZH7

WG3

X X

2A7

WG4

X

X 2A7

WG5

X X

2A7

WG6

X

X__ 2A7

WG7

X X

2B7

WG8

X

-X . 2B7

WG9

X X

3D8

PAL OPT 1 Qtfr 'HOT J INSTALLED
PAL OPTION NOT INSTALLED
USER(L) OPTION NOT INSTALLED

1. ALL CAPS ARE O.lwF, 50 V UNLESS MARKED
OTHERWISE.

2. ALL RESISTORS ARE 2.2K,5%,l/4W UNLESS
MARKED OTHERWISE.

3. ZB2-8 IS PIN 8 OF AN IC AT P.C. BOARD LOCATION
82 SHOWN ON THIS SHEET.

3ZB8-2 IS PIN 2 OF AN IC AT RC. BOARD
LOCATION B8 SHOWN ON SHEET 3.

4. RBI IS RESISTOR *1 IN P.C. BOARD ROW 'b'.

5. C A3 IS CAPACITOR *3 IN P.C. BOARD ROW V.

6. ZH6 IS AN IC AT P.C. BOARD LOCATION ROW 'H',
COLUMN '6' (HI6HEST IS 14).

9-21-83 9WL .
DATE/APPVD

TITLE

I XXX MAIN BOARD LOGIC

ENG. 'Mfc>-8£ |DRN. B Y:

XL 4

DWG. NO.

REV.

7039022

A

|8HEET | OF 4 !

6-5

Franklin Technical Manual ACE 1000/1200 Motherboard Rev A P/N 1100019-01

6-7

6-9

Franklin Technical Manual ACE 1000/1200 Motherboard Rev A P/N 1100019-01

6-11

Franklin Technical Manual ACE 1000/1200 Motherboard Rev A P/N 1100019-01

PARTS LIST
MOTHER BOARD
P/N 1100019-01 REV A

PART NUMBER REV QTY DESCRIPTION

1100019-01
1. 1331428P11

A

A

1

1

PCB ASY, MAIN BOARD, 1XXX
PROG'D PROM, COLOR 256x4

ZD14

2. 4000035

1

RES,

330ohm 1/4W 5% .50

RE3

3. 4000036

1

RES,

lOohm 1/4W 5 % .50

RF1

4. 4000037

2

RES,

27ohm 1/4W 5% .50

RB3 , RL3

5. 4000038

2

RES,

47ohm 1/4W 5 % .50

RE5 , RE6

6. 4000039

6

RES,

lOOohm 1/4W 5% .50

RB6, RK2-5,

7. 4000040

1

RES,

150ohm 1/4W 5% .50

RJ1

RE4

8. 4000041

6

RES,

IK 1/4W 5% .50

RBI , RB2 , RB7 ,

9. 4000042

2

RES,

1.5K 1/4W 5% .50

RD3 RH9 , 10
RF3 , RF9

10. 4000045

2

RES,

12K 1/4W 5% .50

RC2, RG1

11. 4000046

1

RES,

47K 1/4W 5 % .50

RB4

12. 4000047

1

RES,

1M 1/4W 5% .50

RH7

13. 4000050

10

RES,

2.2K 1/4W 5 % .50

RB5 , 8 , RC4 ,

14. 4000061

1

RES,

680ohm 1/4W 5% .50

RD2, RE1,
RH1-4 , RK1
RH5

15. 4000064

2

RES,

200ohm 1/4W 5% .50

RE8 , RL1

16. 4000066

5

RES,

6.2K 1/4W 5% .50

RF4-8

17. 4000067

1

RES,

56K 1/4W 5 % .50

RH8

18. 4000069

8

RES,

Oohm 0W .50

WC1, WF1 , WG9

19. 4000099

2

RES,

1.6M 1/4W 5% T&R

WG1, 3, 5, 7
RC1, RD1

20. 4001006

1

POT,

200ohm

RL2

21. 4001508

2

CAP,

lOOul 16V AL EL AXL

CK1 , CL1

22. 4001548

2

CAP,

220pf 50V MONO GLASS .

50

CB4, CG4

23. 4001551

1

CAP,

lOOOpf 50V MONO GLASS

.50

CH8

24. 4001552

4

CAP,

. 022uf 50V MONO GLASS

.50

CK12 , CK14-16

25. 4001553

138

CAP,

.luf 50V MNO/GLS .50

CB1-3, CB5-8,

26. 4001554

2

CAP,

47PF 50V MNO/GLS .50

CC1-18, CD2,4,
8,10,12,14-22,
CE3 ,4,6,9, 14-26,
CF1-9, CF11.12,
14, CGI, 3, 5-12
CHI-7, CH9-13 ,
CJ2-12, CK2-11,
CK13.18, CL6-31
CF13 , CE5

7-1

Motherboard Rev A P/N 1100019-01 ACE 1000/1200 Franklin Technical Manual

PART NUMBER

REV

QTY

DESCRIPTION

27. 4001556

. . .

13

CAP, lOOpf 50V MNO/GLS .50

CD5-7, 9, 11, 13
CE7 , CE8, 10-13,
CF10

28. 4001562

1

CAP, 15uf 35V AL EL AXL .75

CH14

29. 4001570

1

CAP, 4.7uf 35V AL EL AXL

CG2

30. 4001571

5

CAP, lOuf 16V AL EL AXL

CD1 , 3 , CE1 , 2 , CJ1

31. 4002500

1

IC, 7404

ZC11

32. 4002503

3

IC, 74LS02

ZB4 , ZF11, ZG12

33. 4002505

4

IC, 74LS08

ZB11 , ZG5 , ZG7 , ZJ1

34. 4002507

1

IC, 74LS11

ZB 12

35. 4002508

2

IC, 74LS20

ZD2 , ZG6

36. 4002509

3

IC, 74LS32

ZC14 , ZG8 , ZG10

37. 4002510

2

IC, 74LS51

ZC13 , ZE1

38. 4002512

3

IC, 74LS86

ZC6 , ZC7 , ZG9

39. 4002513

5

IC, 74LS138

ZH1, ZH8 , ZH9 ,
ZJ2 , ZJ12

40. 4002516

8

IC, 74LS153

ZC10, ZD8 , ZE3 ,
ZE8-11, ZF2

41. 4002517

5

IC, 74LS161

ZD9-12, ZC3

42. 4002519

1

IC, 74LS175

ZG3

43. 4002521

1

IC, 74LS251 ** TI ONLY**

ZJ14

44. 4002522

4

1C, 74LS257

ZC4, ZC12, ZD4,
ZD7

45. 4002524

1

IC, 74LS283

ZE12

46. 4002528

2

IC, 555

ZC14 , ZC18

47. 4002529

1

IC, 558

ZJ13

48. 4002532

1

IC, 6502

ZJ8

49. 4002533

2

IC, 8T28

ZJ10, 11

50. 4002534

3

IC, 8T97

ZJ3-5

51. 4002538

1

IC, 74LS368

ZL1

52. 4002541

1

IC, 74LS27

ZG11

53. 4002555

2

IC, 9334

ZG14 , ZH12

54. 4002556

1

IC, 7438

ZH13

55. 4002562

1

IC, 556

ZH14

56. 4002564

3

IC, 74LS10

ZC2 , ZF12M, ZG4

57. 4002568

7

IC, 74LS174 ** TI OR NAT**

ZC8 , ZD5 ,6,13
ZE13 , ZG13

58. 4002571

8

IC, 4164-20

ZF3-10

59. 4002573

2

IC, 74LS399

ZC9, ZE14

60. 4002589

1

IC, 9333B 0144

ZH2

61. 4002590

1

IC, 9333B 0145

ZH4

62. 4002591

1

IC, 9333B 0146

ZH5

63. 4002592

1

IC, 9333B 0147

ZC5

64. 4002593

1

IC, 9333B 0148

ZH7

65. 4002595

4

IC, 74LS74

ZB6 , ZD1 , ZL13 ,
ZF13

66. 4002610

1

IC, 7486

ZE5

67. 4002611

1

IC, 74175

ZE4

68. 4002612

1

IC, 74195

ZE2

7-2

Franklin Technical Manual ACE 1000/1200 Motherboard Rev A P/N 1100019-01

PART NUMBER REV QTY DESCRIPTION

69. 4003000

70. 4003500

71. 4003501

72. 4003502

73. 4005008

74. 4005009

75. 4006501

76. 4007000

77. 4007001

78. 4007002

79. 4010003

80. 4010011

1 IC, 6B-2012

2 RESNET, IK-9

1 RESENT, IK-7

1 RESENT, 2.2K-7

4 INDUCTOR, FERRITE BEAD VOLT.

2 INDUCTOR, FERRITE BEAD VIDEO

1 DIODE, IN4148

2 XSTR, 2N3904

2 XSTR, 2N4258

1 XSTR, MPSA13

10 SOCKET, IC 16 PIN DIP

6 SOCKET, IC 24 PIN DIP/DIMP

81. 4010012

82. 4010018

83. 4010520

84. 4010533

85. 4010550

86. 4010567

87. 4010554

88. 4024500

89. 4027000

90. 4027001

91. 4027006

92. 4031001

93. 4034501

94. 4039022

1 SOCKET, IC 40 PIN DIP/DIMP

1 SOCKET, POLARIZED, 16 PIN

8 CONN, 25/50 PIN PC EDGE

1 CONN, 093 HDR 5219

2 CLIP, SHORTING

1 PIN, KEYING

2 CONN, 20 PIN DUAL PC MT DVR

CTR

1 CONN, PHON FEM. PC RT ANGL

4 CONN, .100 CTR WAFER 1 PIN

2 CONN, .100 CTR WAFER 2 PIN

LOCK

3 CONN, .100 CTR WAFER 4 PIN

STRAI

1 ADHES PAD, PAUM DBL 3/8xl/2
1 CRYSTAL, 14.318180

A 1 PCB , ACE 1000/1200 64KC-32K ROM

ZH10

RSF1 , 2

RSL1

RSJ1

LL2-LL5

LL6-LL7

CRB1

QR1 , QF1

QE1, QE2

QC1

ZF1 , ZK14 , ZF3-10

ZH4 ,5 ZC5.ZH2,

7,10

ZJ8

ZD3

JO-7

POWER

Y3-X3-X3 , JH1
J6-10

JH2 , JJ1
JL3

JL4, X3 , XY3, Y3

JB1 , JC1

JE1 , JH1, JL2

Y1

Y1

7-3

MPI DISK DRIVE

TABLE OF CONTENTS

GENERAL INFORMATION 1-1

SPECIFICATIONS 2-1

INSTALLATIONS 3-1

THEORY OF OPERATIONS 4-1

DISASSEMBLY 5-1

MAINTENANCE 6-1

PARTS LISTS 7-1

1

Franklin Technical Manual

ACE 1000/1200

Disk Drive MPI

GENERAL INFORMATION

The MPI. (Micro Peripherals Inc.), 5.25" floppy disk drive was introduced
in the FRANKLIN ACE 1000's and 1200's in the fall of 1983. MPI provides the
mechanical assembly, model 51MS-100, with the motor drive board attached to
the rear of the unit. FRANKLIN builds and installs the analog card along
with the sheetmetal covers.

The MPI drive can be identified without removing it from either the 1200,
1100 tops or the ACE 10 case. When observing the drive from the front a
small lever can be seen inside the right side of the disk slot. This lever will
prevent the door assembly from being closed and damaging the disk if the
disk is not completely inserted.

1-1

Franklin Technical Manual

ACE 1000/1200

Disk Drive MPI

SPECIFICATIONS

MEDIA

SINGLE-SIDED DISKETTE

BYTES PER SECTOR

256

TRACK DENSITY

48 TP1

SECTORS PER TRACK

DOS 3.2

13

DOS 3.3

16

APPLE PASCAL

16

CP/M

16

TRACKS PER DISKETTE

35

CAPACITY

DOS 3.2

116K BYTES

DOS 3.3

143K BYTES

APPLE PASCAL

143K BYTES

CP/M

143K BYTES

DISK SPEED

300 RPM

LATENCY

100 msec

TRACK TO TRACK ACCESS

18 msec

TRANSFER RATE

250 kbps

READ/WRITE HEAD POSITIONER

SPLIT-BAND ACTUATOR

2-1

Franklin Technical Manual

ACE 1000/1200

Disk Drive MP1

INSTALLATION INFORMATION

The MPI disk drive can be used with the ACE 100, 1000, or 1200 computers,
either as a stand alone ACE 10 or installed in a 1100 or 1200 top. When
setting up a two or more drive system all drives should be the same brand,
either all MPI or all Shugart. It is not recommended having - two different
make drives in the same system.

The drive comes equipped with a controller cable attached at one end to the
drive. The other end of the cable needs to be plugged into either a con-
troller card or motherboard depending on which type of computer is being
used. All of the motherboards and all but a few very old controller cards
have plugs designed to prevent improper installation of the cable. If the
drive is to be plugged into an old style controller card be sure to install
cable correctly to prevent damage to both the controller card and the analog
card in the disk drive.

3-1

Franklin Technical Manual

ACE 1000/1200

Disk Drive MPI

THEORY OF OPERATION

The ANALOG-M board, located on top of the mechanical drive section,
receives its power source and control signals from the disk controller. Listed
below are the major functions of the board and a brief description of how it
is done.

READ CIRCUIT

Flux changes on the disk are picked up by the read /write coils and amplified
approximately 100 times by Ul. The amplified signal is then buffered by
transistors Q1 and Q2 before being filtered by L1-L4. The signal then goes
through differentiator U2 before going to the comparator, U3. The
comparator output changes state, high or low, for each flux change. I.C.'s
U7 and U8 are used to filter this output. The output of this circuit is trans-
mitted to the controller card through connector J2-16.

WRITE CIRCUIT

Write data comes from the controller through connector J2-18 and is then
buffered by U6 before going to Ul. Ul takes the data signal and controls

the coils in the read /write head to make flux changes on the disk. The
amount of current going to the coils can be adjusted by VR1.

ERASE CIRCUIT

When writing, the nominal width of the data track is 0.013 inch. The erase
circuit trims the track down to 0.012 inch. The MPI drive uses a tunnel
erase head which displaces the erase poles from the read /write head. To
compensate for this, the erase enable signal is delayed by IC's U9 and U10.
The erase coil should be activated whenever data is being written to the
disk. The erase function should clean the sides of the track being written to
eliminate spillover to adjacent tracks. The erase coil is active when the
signal out of U4-15 is low.

4-1

4-2

Analog-M-Board

J

Disk Drive MPI ACE 1000/1200 Franklin Technical Manual

Franklin Technical Manual

ACE 1000/1200

Disk Drive MPI

DISASSEMBLY

The MPI disk drive assembly can be broken down into two major groups,
mechanical and electrical. The electrical part consists of the analog card
located on top of the drive, the remainder is the mechanical part. The small
printed circuit board located on the rear of the drive is considered part of
the mechanical section.

FRANKLIN does not stock or supply a complete parts inventory for the
mechanical section of the drive. A few commonly used parts are available,
these can be found in the parts section of this manual.

Listed below are procedures for disassembling the following:

1. Analog Card

2. Shield Assembly

3 . Load Pad

4 . Activity LED

ANALOG CARD

Remove six wiring connectors.

Remove two screws at each side
of board.

Slide board out towards the rear
of the unit.

5-1

Disk Drive MPI

ACE 1000/1200

Franklin Technical Manual

SHIELD ASSEMBLY

Press down in the center of the
shield and snap off the right
side of the carrier.

LOAD PAD

Remove analog card and shield
assembly.

Open door.

Use small pliers or tweezers to
squeeze plastic tabs until the
load pad drops out of upper
arm.

ACTIVITY LED

Remove four screws holding
front bezel to drive.

NOTE: There are two different

type of screws used.

Use a small screwdriver to pry
off indicator ring.

From the front side of the bezel
press out the LED.

NOTE: When reinstalling the LED
the green wire goes on the
longest LED lead.

Activity Indicator

Activity Indicator Clip

Activity Indicator Ring

5-2

Franklin Technical Manual

ACE 1000/1200

Disk Drive MPI

MAINTENANCE

1. PREVENTIVE MAINTENANCE

2. TEST AND ADJUSTMENT PROCEDURES

3. TROUBLE SHOOTING GUIDES

4. EXPLODED DRAWING

5. SCHEMATIC

6-1

Disk Drive MPI

ACE 1000/1200 Franklin Technical Manual

PREVENTIVE MAINTENANCE

Periodically the read/ write head and load pad should be checked for dirt and
wear.

The read /write head may be cleaned using a lint-free cloth or cotton swab
and either methyl alcohol or 91% isopropyl alcohol. Use a dental mirror to
inspect the load pad. Lifting the load pad arm more than 1/2" may damage
the arm and spring assembly, see Fig. 6-1.

CAUTION

Lubrication of the read /write head rails is not recommended by either
Franklin or MPI. Tests have indicated that any lubricant used will eventually
migrate to the head and cause premature failure.

LOAD PAD ARM

HEAD RAILS

Figure 6-1

6-2

Franklin Technical Manual

ACE 1000/1200

Disk Drive MPI

MPI DISK DRIVE

INTRODUCTION

Errors when reading or writing diskettes can be caused by a number of
factors. These include incorrect operating procedures, faulty programming,
damaged diskettes, airborne contaminates, electrical interference, and
misaligned disk drives. This Bulletin will deal with those problems associated
with mechanical and electrical misalignment of the disk drive and controller
units.

EQUIPMENT REQUIRED

A. Franklin ACE Computer and monitor.

B. Franklin ACE 10 Disk Drive with Controller.

C. Dual trace oscilloscope with 2 probes.

D. Dealer Diagnostic Diskette.

E. Alignment Diskette (Dysan 208/10 or equivalent).

F. Blank diskette.

G. Digital voltmeter.

SETUP

TEST

EQUIPMENT

SCOPE

DIGITAL

VOLTMETER

INIT .
DISK

DISK

DYSAN

FRANKLIN

DIAGNOSTIC

AZIMUTH

X

X

X

TRACK ALIGNMENT

X

X

X

TRACK 0 STOP

X

WRITE CURRENT

X

DISK SPEED

X

Rl, R2

CONTROLLER

X

X

R/W VERIFY

X

X

6-3

Disk Drive MPI

ACE 1000/1200 Franklin Technical Manual

AZIMUTH TEST PROCEDURES

1. Boot Dealer Diagnostics diskette and select Disk Drive Test.

2. Select the (D) Azimuth test.

3. Using a dual trace oscilloscope attach channel A probe to L3 and channel
B probe to L4 on analog card. Figure 6-3..

4. Set volts /division to 20mV on both channels.

5. Invert Channel B.

6. Set time/ division to 1ms.

7. Remove Diagnostics diskette and insert Dysan diskette. Three groups of
four bars should appear on the screen.

8. Compare the MIDDLE group of bars on the scope to those in Figure 6-2.
All of the patterns shown are acceptable EXCEPT C.

9. If the first or fourth bar is larger than either of the center two bars the
azimuth is unacceptable and the drive should be replaced.

C

D

Figure 6-2.

6-4

Figure 6-3. Analog-M-Board MPI Disk Drive

Franklin Technical Manual ACE 1000/1200 Disk Drive MPI

Disk Drive MPI

ACE 1000/1200

Franklin Technical Manual

TRACK ALIGNMENT

1. If you have already booted the Dealer Diagnostic diskette for the Azimuth
test, hit ESC key to bring up the disk submenu. If you are starting
with this test you will have to boot the Dealer Diagnostic.

2. Select the ALIGNMENT test from the disk submenu.

3. Remove the Dealer Diagnostic diskette and insert the Alignment diskette.

4. Hit the slash key (/) to go to track 10 on the alignment disk.

5. With the scope probes connected as for AZIMUTH TEST (Figure 6-3) ad-
just the scope to give a steady display of at least two lobes as shown in
Figure 6-4. A time base of 10 msec/div will usually give the proper
display .

6. The optimum display is shown in Figure 6-4B where both lobes are of
equal amplitude. If one lobe is smaller and is not within 80% the size of
the larger lobe, an adjustment will be necessary.

With the drive still running, carefully turn the disk drive on its side.
Locate the two socket head screws holding the stepper motor to the
chassis of the drive and loosen them slightly. While observing the

oscilloscope display, rotate the stepper motor carefully until the two lobes
are equal in size. Tighten the two screws and observe that the two lobes
are still the same size. Loosen and adjust as necessary.

Check the alignment by first pressing the right arrow key and then the
left arrow key. If the lobes are still not within 80% of each other the
drive will have to be realigned and checked again. It may be necessary
to split the difference in the error to remain within the 80% limit. The
final oscilloscope display should look like Figure 6-4B.

Figure 6-4. Track Alignment

6-6

Franklin Technical Manual

ACE 1000/1200

Disk Drive MP1

TRACK 00 STOP ADJUSTMENT

1. Boot up Dealer Diagnostics and select disk test.

2. Select the ALIGNMENT test from the disk submenu.

3. Use slash key (/) to position the head at track 00. Check distance from
head assembly to set screw. Figure 6-5.

There should be a distance of .010 inch. If a thickness gauge is not
available turn setscrew in until it just touches the head assembly. Back
set screw out 1/2 revolution.

Use slash key to move head to other tracks and back to track 00. Re-
check distance.

Figure 6-5. Adjustment Screw

6-7

Disk Drive MPI

ACE 1000/1200

Franklin Technical Manual

WRITE CURRENT ADJUSTMENT

1. Adjust digital voltmeter to read 2 volts, DC scale.

2. Both 13 and 16 sector selectors should be jumpered. Figure 6-8.

3. Power up the computer, floating point basic cursor will appear at the top
of the screen. (Drive will not spin as in usual operation.)

4. Key in the command - CALL 50688 - and hit return. A pound sign (#)
will appear on the screen.

5. Key in - R - and hit return. The disk drive will start spinning and the
pound sign and cursor will appear again.

6. Key in - AAW - and hit return. (Drive will continue spinning)

7. Use the voltmeter to take a voltage reading across R17. Figure 6-6.

8. If needed adjust the blue pot (Figure 6-6) on top of the analog card until
the voltmeter reads .350 volts, plus or minus .010 volts.

ADJUST

R 17

Figure 6-6. Analog-M-Board

6-8

Franklin Technical Manual

ACE 1000/1200

Disk Drive MPI

DISK MOTOR SPEED ADJUSTMENT

The disk drive motor speed can be adjusted in two ways. The speed can be
set by visually observing the timing disk on the bottom of the drive under
fluorescent lighting, or it can be set with the use of the Dealer Diagnostic
diskette.

A. VISUAL ADJUSTMENT

Position the drive so that the strobe disk on the bottom can be seen (you
must be in an area lighted by fluorescents for this procedure to be
effective). Figure 6-7.

Do not install a disk in the drive and turn on the power, this will allow
the drive to spin while you make any speed checks or adjustments.

Adjust the pot on the small PC board mounted on the rear of the disk
drive using a small flat screwdriver. Turn the pot until the outside band
of dark lines appears motionless.

Figure 6-7. Speed Adjustment

B. DEALER DIAGNOSTIC SPEED ADJUSTMENT

Install the Dealer Diagnostic diskette in the disk drive and reset the
computer to boot the diskette. The monitor screen will clear and display
the diagnostic menu. Select the disk test from the menu. A secondary
disk menu will then be displayed. Select the speed test from the
secondary menu. The drive under test will be displayed. Adjust the pot
on the rear of the disk drive for a displayed setting of 200 ms. The
tolerance is + or - 1 ms.

6-9

Disk Drive MPI

ACE 1000/1200 Franklin Technical Manual

HI, R2, CONTROLLER TEST ^

Connect a disk drive to the drive 1 position of the disk controller. Jumper
the two left pins of J4 together (See Figure 6-8). Do not disturb the two
right pins. They must also be jumpered together.

Insert initialized diskette.

Apply power to the computer. The computer will initialize and the floating
point basic prompt will be displayed.

Type the following:

CALL 50688 (RETURN)

AAW (RETURN) (ESC)

Figure 6-8. ACE 10 Disk Controller.

Connect the oscilloscope A channel probe to TP1 on the disk controller. Ad-
just R1 on the disk controller for a pulse width of 5.4 micro seconds.

Type the following:

99VV (RETURN)

Connect the oscilloscope A channel probe to TP2 on the disk controller,
just R2 on the disk controller for a pulse width of 3.8 micro seconds.

Ad-

6-10

Franklin Technical Manual

ACE 1000/1200

Disk Drive MPI

11. R/W VERIFY TEST

This test should be performed after a disk drive has been adjusted to verify
that it is in good working condition.

1. Install Dealer Diagnostic diskette and boot-up. Pick Disk Test (F)
from menu.

2. When the Disk Diagnostics menu appears pick R/W VERIFY. (F).

3. Remove Dealer Diagnostics and insert initialized diskette.

4. Press return to start test.

If the test can make one or more passes with no errors the drive unit is in
proper working condition.

6-11

Disk Drive MPI

ACE 1000/1200 Franklin Technical Manual

TROUBLESHOOTING GUIDE — ANALOG CARD
This guide assumes that the following items are working properly:
A . Disk

B . Drive Mechanical Assembly

C . Controller

D . Computer

SYMPTOM

LOCATION

COMPONENT

1. DEAD DRIVE

U5

74LS125

CONNECTED IMPROPERLY

U6

74LS86

Q5

MPSU51

C14

470uF

C19

220uF

2. NO BOOT — DISK OK

U2

NE592

U3

LM311

U4

ULN2003

3. NO BOOT — ERASES DISK

U5

74LS125

U6

74LS86

4. I/O ERROR

U1

CA3054

U4

ULN2003

U6

74LS86

5. DRIVE WORKS — BUT

Q5

MPSU51

ACTIVITY LIGHT DOES
NOT GO OFF

Franklin Technical Manual

ACE 1000/1200

Disk Drive MP1

SHOWN BELOW ARE TYPICAL SCOPE PATTERNS THAT SHOULD BE
OBSERVED AT THE LOCATIONS GIVEN.

SCOPE SETTINGS VOLTS/DIV .2 TIME/DIV lus

READ CIRCUIT

STATUS LOCATION PATTERN

Power-on drive not activated U1 - Pins 7 or 8

Reading data from disk U1 - Pins 7 or 8

ie; HELLO PROGRAM

Reading data from disk
ie; HELLO PROGRAM

U2 - Pins 7 or 8

Reading data from disk
ie; HELLO PROGRAM

U6 - Pin 11

_n__n_n_

Reading data from disk
ie; HELLO PROGRAM

U5 - Pin 6

_n

UL

6-13

6-15

Franklin Technical Manual

ACE 1000/1200

Disk Drive MP1

MPI PART NUMBERS

Mechanical Assy.

4018028

Analog Card

1100027

Activity Lamp

4018036

Belt

4018037

Door Assy.

4018038

Load Pad

4018039

When ordering
ferent types of

or installing disk drive cables note that there are three dif-
cables with different Part Number.

PART #

DESCRIPTION

APPLICATION

4013545

27" UNSHIELDED

ACE 1200's or ACE 1100
tops 27" cable for drive closest
to controller.

4013532-5

33" UNSHIELDED

ACE 1200's or ACE 1000
tops 33" cable for drive
farthest from controller.

4013580

33" SHIELDED*

ALL ACE 10's

*NOTE:

Some of the early shielded cables had just a black shielded covering'. Later
cables have the black covering and a ground terminal at each end. At the
computer end the cable should be attached to a mounting screw for the
motherboard, Fig. 7-1. Drives shipped with the grounded cable have a

ground mounting terminal inside the cover, Fig. 7-2. If a shielded cable with
ground terminals is to be used in a drive without a ground mounting terminal
attach the ground terminal to frame of the drive, Fig. 7-3.

7-1

Disk Drive MPI

ACE 1000/1200 Franklin Technical Manual

Figure 7-2

Disk Drive Cover Mounting

Figure 7-3

Disk Drive Frame Mounting

7-2

FRANKLIN VIDEO MONITOR

TABLE OF CONTENTS

GENERAL INFORMATION 1-1

SPECIFICATIONS 2-1

INSTALLATION 3-1

THEORY OF OPERATIONS 4-1

DISASSEMBLY 5-1

MAINTENANCE 6-1

1

Franklin Technical Manual

Franklin Video Monitor

GENERAL INFORMATION

The Franklin Video Monitor is a high-quality, high-resolution, 12 inch
monochromatic CRT that can be used with any Franklin microcomputer system.
It offers an outstanding combination of features, performances, and
reliability .

The Franklin Video Monitor has a special premium deflection system and green
phosphor CRT with a display that is remarkably easy to read and also very
easy on the operator's eyes. Up to 24 lines containing 80 characters each
can be displayed on the 12 inch diagonal screen.

Designed with a bandwidth greater than 15 MHz, the Franklin Video Monitor
has a rise time of 30 nanoseconds which results in noticeably improved
character of definition. Special DC-coupled circuitry permits the video
display to retain its brightness even when the screen is full of information.
In addition, special shielding allows the monitor to be placed directly atop the
ACE 1000 and ACE 1200 computers.

Conveniently located exterior controls include a power switch with power-on
indicator, brightness, contrast, horizontal and vertical adjustments, plus
horizontal size adjustment. In addition, the Franklin Video Monitor features
an external 40/80 switch that permits you to select a 40 to 80 character
display width to accommodate your video format needs.

1-1

Franklin Technical Manual

Franklin Video Monitor

SPECIFICATIONS

CRT

12" diagonal P31 green phosphor, high-
resolution video display.

Capacity

Twenty-four (24) lines of up to 80 characters
in length.

Controls

Exterior controls for power, brightness, con-
trast, horizontal and vertical adjustments,
horizontal size, selection of 40 or 80 character
display.

Interface

NTSC (EIA, RS-170) composite video input.

Bandwidth

Greater than 15 MHz

Rise Time

30 nanoseconds.

Vertical Rate

54 Hz - 63 Hz

Physical Dimensions

11-3/4" high X 12-1/4" wide X 12" deep

Weight

14 pounds

Environmental

50 F to 90 F, operating
-20 F to 150 F, non-operating

Power

120/220 VAC, 50/60 Hz, 26 watts

2 -]

Franklin Technical Manual

Franklin Video Monitor

INSTALLATION

INTRODUCTION

The MONITOR should be located near an AC power source and in an area that
will provide proper ventilation. There are vents located on the rear and
bottom of the cabinet, permitting air flow through the cabinet.

VERIFY THAT THESE VENTS ARE NOT BLOCKED

REAR PANEL

The Video In jack on the monitors uses a single conductor cable (P/N
4031507). Also located on the rear panel there is a width control and a 40/80
character switch.

DISPLAY CHECK

A quick check of the monitor display can be checked, after installation, by
typing in the following program, using floating point basic.

10 for F = 1 to 959
20 Print "F";

30 Next F
40 GOTO 40

Type RUN and hit RETURN

The screen should fill up with 24 lines and 40 columns of F's with the
exception of the lower right hand corner. Hit BREAK KEY to exit from this
program.

40/80

CHARACTER SWITCH

WIDTH CONTROL

VIDEO CABLE
CONNECTION

REAR PANEL

3-1

Franklin Video Monitor

Franklin Technical Manual

FRONT PANEL

Located on the Front Panel is the ON/OFF switch. Behind the access door
are five user controls to help obtain an optimum display. These controls are:

1 . Contrast

2. Black Level

3 . Vertical Size

4 . Vertical Hold

5 . Horizontal Hold

FRONT PANEL

Franklin Technical Manual

Franklin Video Monitor

THEORY OF OPERATIONS

Once power is applied the monitor is ready to receive and display TEXT and
GRAPHIC DATA. Using the Block diagram on page 4-2, you can follow the
circuit description below.

POWER SUPPLY

Source power from 120 vac enters the power supply to the primary of the
step down transformer which reduces it to approximately 17-1/2 volts. Using
a bridge rectifier and an RC filtering system the final output is held at 12.7
VDC. This circuit is designed in such a way as to produce a constant output
even during line fluxuations on the input thereby preventing the screen from
having an erratic display.

VIDEO CIRCUIT

The Video Input is configured to accept a standard RS170 composite video
with a 75 OHM terminating input. The components in the preamp section are
used to clamp the Video Signal to eliminate any Black Level Shifts with
variation in input signal. The signal is fed to the sync AMP/ SEP circuit
where it is stretched and separated and sent to the output, vertical and
horizontal control circuits. The signal going to the output section passes
through the contrast controller. The output circuit and the beam current
limiter circuit control the level of output signal to prevent unwanted
fluxuations that cause periodic bright spots in the screen.

VERTICAL CIRCUIT

The vertical oscillator, amplifiers, output and blanking circuits make up the
vertical circuit. The sweep circuit is a self-oscillating, DC coupled circuitry
that use complimentary push pull output transistors, a driver transistor, a
differential amplifier transistor and an oscillator transistor. Signals passing
through these components are fed to the deflection yoke with an S correction
signal to produce a linear picture on the CRT.

HORIZONTAL CIRCUIT

The horizontal processor, driver and output circuits make up the horizontal
circuit. The horizontal processor (IC501) is a 221-141 which contains a phase
detector, oscillator, regulator and predriver. A sync and a sawtooth
waveform are fed to the differential amplifier where the output phase
difference is fed to the oscillator. The resulting output sawtooth goes to the
regulator where the signal is temperature compensated for stability and sent
to the predriver. The resulting waveform goes to the driver and output
where the "on" time is adjusted to create the desired display images.

The resulting signals from the vertical and horizontal circuits to the CRT via
the deflection yoke and the Video signal directly to the CRT create the
monochrome images displayed.

4-1

Franklin Technical Manual

Franklin Video Monitor

DISASSEMBLY

Field level maintenance is limited to external adjustments and replacement of
the two power supply fuses. The only disassembly required for this would
be the removal of the back cover.

NOTE: FIRST REMOVE THE POWER CORD FROM THE POWER SOURCE.

Remove the Video cable and the six screws shown in figure 5-1. Slide panel
"C" through its opening and carefully remove the back cover.

1 2

Figure 5-1

Franklin Technical Manual

Franklin Video Monitor

^ MAINTENANCE

The present level of maintenance permitted in the field is limited to the
replacement of fuses FX201 and FX701, both of which are a part of the power
supply circuit. If either fuse is blown the MONITOR will be completely dead.
Access to the fuses is gained by removing the back cover (see Disassembly -
Section 5). Figure 6-1 shows the location of the fuses and their sizes.

Figure 6-1

NOTES:

1 . ALL RESISTOR VALUES ARE IN OHMS (k = 1 ,000, M = 1 ,000,000)
ALL RESISTORS ARE 1 /4-WATT, 5% UNLESS OTHERWISE
SPECIFIED.

2. ALL CAPACITOR VALUES ARE IN jiF (MICROFARADS). UN-
LESS OTHERWISE SPECIFIED.

Frank!:::

Computer

1070 Busch Mem. Hwy
Pennsauken, NJ 08110
Telephone: 609-488-0600

TECHNICAL INFORMATION BULLETIN

BULLETIN #: TBS-001 DATE: 01/13/84

SUBJECT: TROUBLESHOOTING GUIDE - QUICK REFERENCE

This section has been compiled to act as an aid in troubleshooting various
FRANKLIN products. The information contained has been gathered from
FRANKLIN'S factory service centers and also from authorized FRANKLIN
dealers .

Each category has a list of IC's which usually cause that problem. The IC's
are listed with the most common failures first and the least common last.

INDEX

Page #

MOTHERBOARD 2-4

DISK DRIVE 5-6

DUAL I/O CARD

7

1

MOTHERBOARD

Sympton

Location

Component

Garbage on Screen or

F'5

74LS08

Wide Vertical Bars

H3 , H4 , H5

8T97

H10 , Hll

8T28

C-3 thru C-10

4116

H-6

6502

B6 , B7

74LS257

B5 , B8

74LS174

G2

Eprom

Q5

222A Trans.

CA8

.1 uf Cap.

C-ll

7404

C-14

74LS08

Ell, E12 , E13

74LS153

E14

74LS283

Dead Unit, No Video

Crystal

1431818

Nothing

B-l

74LS175

C-2

74LS195

B-2

74586

A-3

73LS00

Q1 & Q2

4258 Trans.

No Video but Computer

A-3

74LS00

is Functioning

Dll thru D14

74LS161

C-14

74LS32

A-4

74166

Q3

3904 on B/W

Motherboard

Qi

3904 on

Color Board

Red & Black Cable

Going Between

Motherboard & Colorboard.

Keyboard Problems

G-13

74LS138

B6 , B7

74LS257

B-10

74LS74

C-ll

7404

CA6 Capacitor

1000 pf

MOTHERBOARD (Cont'd)

Symptom

Location

Component

Hires and Lores Problems

G-14

9334, 74259

B4 , B9

74LS194

H-l

74LS508

B5, B8

74LS257

A-9

74LS257

A-10

74LS151

A-ll

74LS194

A-13

74LS02

A-8

16 Pin Cable
Assembly

Text Problems:

BH

Eprom on
B/W Board

U7

U71.0
Eprom on
Colorboard

A-4

74166

B-2

74S86

A-8

16 Pin Assy.
Colorboard

A-9

74LS257

A-10

74LS151

A-ll

74LS194

Sync Problems

D-ll thru D-14

74LS161

C-14

74LS32

C-13

74LS51

B-13

74LS02

B-14

74LS27

A-12

74LS74

B-ll

74LS08

Slot Problems

H-2 and H-12

74LS138

All Ram

4116

Machine Drops Into Monitor

G-2 thru G-10

Eprom s

All Ram

4116

H-6

6502

Ram Problems

Ell, E12 , E13

74LS153

E14

All of F Row

74LS283

H-2 and H-12

74LS138

B-5 , B-8

74LS174

E-2

74LS139

DISK DRIVE

Controller

Analog

Symptom

Location

Component

Location

Component

Dead Drive —
Connected

U6

74LS05

U5

74LS125

Improperly

U9

74LS32

C14

470uf

U17

9334

Q5

U51

U18

74LS02

U6

74LS86

Ql

U51

C19

220uf

Dead Drive —
Connected

H

74LS05

Properly

El

A2 1.0

No Boot —

A Fl TTTO T* FIT

Clf Q UT7T7TV

nL/d Uu 1 U 1

jiv oJrriiLJJ

Disk OK

U7

74LS123

U4

2003

U3

LM311

U2

NE592

Adjust

Rl, R2

No Boot —

U6

74LS05

■H -

74LS125

m

74LS86

Drive 1 Keeps
Turning

U5

7400

Both Drives
Turn On Mo-
mentarily,. Then
Drive 1 Turns On.
Hit Reset and
Drive 2 Turns
On

U5

7400

Drive Will Not

U6

74LS05

Adjust R2

Write

U10

74LS109

U1

3054

Both Drives On

U5

7400

U5

74LS125

U4

556

U17

9334

I/O Error

U18

74LS02

U1

3054

U4

2003

U6

74LS86

4

DISK DRIVE (Cont'd)

Controller

Analog

Symptom

Location

Component

Location

Component

I/O Error When

U9

74LS32

Doing INIT.

U5

74LS05

U10

74LS109

U17

9334

Volume Mismatch
When Doing INIT.

U6

74LS05

File Cannot

9334

Be Locked

U6

74LS05

File Type Mismatch
When Doing
Copy

U15

74LS373

Cannot Format

U10

74LS109

U1

3054

Destination

Disk

Ull

74LS174

Read/Write

Errors

U17

9334

Drive Works
OK But

Q5

U51

Activity Light
Stays On

DUAL I/O CARD

Symptom

Location

Component

Board passes diagnostics
but alphabet is printed
incorrectly, dropping a
bit.

U19

LS374

Serial port not working

Check Switch Bank #:

1

properly, prints garbage

U12

2661

Garbage on screen

2661

U8

74LS04

U1

74LS32

U2

74ALS08

Blank screen, system
will not operate

U7

74LS32